test version of ALAC decoder,

trying to clean up audio interfaces

AudioCodecsDotNet/AudioCodecsDotNet.cs

@@ -0,0 +1,613 @@
+using System;
+using System.IO;
+using System.Text;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+
+namespace AudioCodecsDotNet
+{
+	public interface IAudioSource
+	{
+		uint Read(byte[] buff, uint sampleCount);
+		ulong Length { get; }
+		ulong Position { get; set; }
+		NameValueCollection Tags { get; set; }
+		ulong Remaining { get; }
+		void Close();
+		int BitsPerSample { get; }
+		int ChannelCount { get; }
+		int SampleRate { get; }
+		string Path { get; }
+	}
+
+	public interface IAudioDest
+	{
+		void Write(int[,] buff, uint sampleCount);
+		bool SetTags(NameValueCollection tags);
+		void Close();
+		long FinalSampleCount { set; }
+		string Path { get; }
+	}
+
+	public class AudioCodecsDotNet
+	{
+		public static unsafe void FLACSamplesToBytes_16(int[,] inSamples, uint inSampleOffset,
+			byte[] outSamples, uint outByteOffset, uint sampleCount, int channelCount)
+		{
+			uint loopCount = sampleCount * (uint)channelCount;
+
+			if ((inSamples.GetLength(0) - inSampleOffset < sampleCount) ||
+				(outSamples.Length - outByteOffset < loopCount * 2))
+			{
+				throw new IndexOutOfRangeException();
+			}
+
+			fixed (int* pInSamplesFixed = &inSamples[inSampleOffset, 0])
+			{
+				fixed (byte* pOutSamplesFixed = &outSamples[outByteOffset])
+				{
+					int* pInSamples = pInSamplesFixed;
+					short* pOutSamples = (short*)pOutSamplesFixed;
+
+					for (int i = 0; i < loopCount; i++)
+					{
+						*(pOutSamples++) = (short)*(pInSamples++);
+					}
+				}
+			}
+		}
+		
+		public static unsafe void FLACSamplesToBytes_24(int[,] inSamples, uint inSampleOffset,
+			byte[] outSamples, uint outByteOffset, uint sampleCount, int channelCount)
+		{
+			uint loopCount = sampleCount * (uint)channelCount;
+
+			if ((inSamples.GetLength(0) - inSampleOffset < sampleCount) ||
+				(outSamples.Length - outByteOffset < loopCount * 3))
+			{
+				throw new IndexOutOfRangeException();
+			}
+
+			fixed (int* pInSamplesFixed = &inSamples[inSampleOffset, 0])
+			{
+				fixed (byte* pOutSamplesFixed = &outSamples[outByteOffset])
+				{
+					int* pInSamples = pInSamplesFixed;
+					byte* pOutSamples = pOutSamplesFixed;
+
+					for (int i = 0; i < loopCount; i++)
+					{
+						uint sample_out = (uint)*(pInSamples++);
+						*(pOutSamples++) = (byte)(sample_out & 0xFF);
+						sample_out >>= 8;
+						*(pOutSamples++) = (byte)(sample_out & 0xFF);
+						sample_out >>= 8;
+						*(pOutSamples++) = (byte)(sample_out & 0xFF);
+					}
+				}
+			}
+		}
+
+		public static unsafe void FLACSamplesToBytes(int[,] inSamples, uint inSampleOffset,
+			byte[] outSamples, uint outByteOffset, uint sampleCount, int channelCount, int bitsPerSample)
+		{
+			if (bitsPerSample == 16)
+				AudioCodecsDotNet.FLACSamplesToBytes_16(inSamples, inSampleOffset, outSamples, outByteOffset, sampleCount, channelCount);
+			else if (bitsPerSample == 24)
+				AudioCodecsDotNet.FLACSamplesToBytes_24(inSamples, inSampleOffset, outSamples, outByteOffset, sampleCount, channelCount);
+			else
+				throw new Exception("Unsupported bitsPerSample value");
+		}
+
+		public static unsafe void BytesToFLACSamples_16(byte[] inSamples, int inByteOffset,
+			int[,] outSamples, int outSampleOffset, uint sampleCount, int channelCount)
+		{
+			uint loopCount = sampleCount * (uint)channelCount;
+
+			if ((inSamples.Length - inByteOffset < loopCount * 2) ||
+				(outSamples.GetLength(0) - outSampleOffset < sampleCount))
+			{
+				throw new IndexOutOfRangeException();
+			}
+
+			fixed (byte* pInSamplesFixed = &inSamples[inByteOffset])
+			{
+				fixed (int* pOutSamplesFixed = &outSamples[outSampleOffset, 0])
+				{
+					short* pInSamples = (short*)pInSamplesFixed;
+					int* pOutSamples = pOutSamplesFixed;
+
+					for (int i = 0; i < loopCount; i++)
+					{
+						*(pOutSamples++) = (int)*(pInSamples++);
+					}
+				}
+			}
+		}
+	}
+
+	public class DummyWriter : IAudioDest
+	{
+		public DummyWriter(string path, int bitsPerSample, int channelCount, int sampleRate)
+		{
+		}
+
+		public bool SetTags(NameValueCollection tags)
+		{
+			return false;
+		}
+
+		public void Close()
+		{
+		}
+
+		public long FinalSampleCount
+		{
+			set
+			{
+			}
+		}
+
+		public void Write(int[,] buff, uint sampleCount)
+		{
+		}
+
+		public string Path { get { return null; } }
+	}
+
+	public class SilenceGenerator : IAudioSource
+	{
+		private ulong _sampleOffset, _sampleCount;
+
+		public SilenceGenerator(uint sampleCount)
+		{
+			_sampleOffset = 0;
+			_sampleCount = sampleCount;
+		}
+
+		public ulong Length
+		{
+			get
+			{
+				return _sampleCount;
+			}
+		}
+
+		public ulong Remaining
+		{
+			get
+			{
+				return _sampleCount - _sampleOffset;
+			}
+		}
+
+		public ulong Position
+		{
+			get
+			{
+				return _sampleOffset;
+			}
+			set
+			{
+				_sampleOffset = value;
+			}
+		}
+
+		public int BitsPerSample
+		{
+			get
+			{
+				return 16;
+			}
+		}
+
+		public int ChannelCount
+		{
+			get
+			{
+				return 2;
+			}
+		}
+
+		public int SampleRate
+		{
+			get
+			{
+				return 44100;
+			}
+		}
+
+		public NameValueCollection Tags
+		{
+			get
+			{
+				return new NameValueCollection();
+			}
+			set
+			{
+			}
+		}
+
+		public uint Read(byte[] buff, uint sampleCount)
+		{
+			uint samplesRemaining, byteCount, i;
+
+			samplesRemaining = (uint)(_sampleCount - _sampleOffset);
+			if (sampleCount > samplesRemaining)
+			{
+				sampleCount = samplesRemaining;
+			}
+
+			byteCount = sampleCount * 2 * 2;
+			for (i = 0; i < byteCount; i++)
+			{
+				buff[i] = 0;
+			}
+
+			_sampleOffset += sampleCount;
+
+			return sampleCount;
+		}
+
+		public void Close()
+		{
+		}
+
+		public string Path { get { return null; } }
+	}
+
+	public class WAVReader : IAudioSource
+	{
+		FileStream _fs;
+		BinaryReader _br;
+		ulong _dataOffset, _dataLen;
+		ulong _samplePos, _sampleLen;
+		int _bitsPerSample, _channelCount, _sampleRate, _blockAlign;
+		bool _largeFile;
+		string _path;
+
+		public WAVReader(string path)
+		{
+			_path = path;
+			//_fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
+			_fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read, 0x10000, FileOptions.SequentialScan);
+			_br = new BinaryReader(_fs);
+
+			ParseHeaders();
+
+			_sampleLen = _dataLen / (uint)_blockAlign;
+			Position = 0;
+		}
+
+		public void Close()
+		{
+			_br.Close();
+
+			_br = null;
+			_fs = null;
+		}
+
+		private void ParseHeaders()
+		{
+			const long maxFileSize = 0x7FFFFFFEL;
+			const uint fccRIFF = 0x46464952;
+			const uint fccWAVE = 0x45564157;
+			const uint fccFormat = 0x20746D66;
+			const uint fccData = 0x61746164;
+
+			uint lenRIFF;
+			long fileEnd;
+			bool foundFormat, foundData;
+
+			if (_br.ReadUInt32() != fccRIFF)
+			{
+				throw new Exception("Not a valid RIFF file.");
+			}
+
+			lenRIFF = _br.ReadUInt32();
+			fileEnd = (long)lenRIFF + 8;
+
+			if (_br.ReadUInt32() != fccWAVE)
+			{
+				throw new Exception("Not a valid WAVE file.");
+			}
+
+			_largeFile = false;
+			foundFormat = false;
+			foundData = false;
+
+			while (_fs.Position < fileEnd)
+			{
+				uint ckID, ckSize, ckSizePadded;
+				long ckEnd;
+
+				ckID = _br.ReadUInt32();
+				ckSize = _br.ReadUInt32();
+				ckSizePadded = (ckSize + 1U) & ~1U;
+				ckEnd = _fs.Position + (long)ckSizePadded;
+
+				if (ckID == fccFormat)
+				{
+					foundFormat = true;
+
+					if (_br.ReadUInt16() != 1)
+					{
+						throw new Exception("WAVE must be PCM format.");
+					}
+					_channelCount = _br.ReadInt16();
+					_sampleRate = _br.ReadInt32();
+					_br.ReadInt32();
+					_blockAlign = _br.ReadInt16();
+					_bitsPerSample = _br.ReadInt16();
+				}
+				else if (ckID == fccData)
+				{
+					foundData = true;
+
+					_dataOffset = (ulong)_fs.Position;
+					if (_fs.Length <= maxFileSize)
+					{
+						_dataLen = ckSize;
+					}
+					else
+					{
+						_largeFile = true;
+						_dataLen = ((ulong)_fs.Length) - _dataOffset;
+					}
+				}
+
+				if ((foundFormat & foundData) || _largeFile)
+				{
+					break;
+				}
+
+				_fs.Seek(ckEnd, SeekOrigin.Begin);
+			}
+
+			if ((foundFormat & foundData) == false)
+			{
+				throw new Exception("Format or data chunk not found.");
+			}
+
+			if (_channelCount <= 0)
+			{
+				throw new Exception("Channel count is invalid.");
+			}
+			if (_sampleRate <= 0)
+			{
+				throw new Exception("Sample rate is invalid.");
+			}
+			if (_blockAlign != (_channelCount * ((_bitsPerSample + 7) / 8)))
+			{
+				throw new Exception("Block align is invalid.");
+			}
+			if ((_bitsPerSample <= 0) || (_bitsPerSample > 32))
+			{
+				throw new Exception("Bits per sample is invalid.");
+			}
+		}
+
+		public ulong Position
+		{
+			get
+			{
+				return _samplePos;
+			}
+			set
+			{
+				ulong seekPos;
+
+				if (value > _sampleLen)
+				{
+					_samplePos = _sampleLen;
+				}
+				else
+				{
+					_samplePos = value;
+				}
+
+				seekPos = _dataOffset + (_samplePos * (uint)_blockAlign);
+				_fs.Seek((long)seekPos, SeekOrigin.Begin);
+			}
+		}
+
+		public ulong Length
+		{
+			get
+			{
+				return _sampleLen;
+			}
+		}
+
+		public ulong Remaining
+		{
+			get
+			{
+				return _sampleLen - _samplePos;
+			}
+		}
+
+		public int ChannelCount
+		{
+			get
+			{
+				return _channelCount;
+			}
+		}
+
+		public int SampleRate
+		{
+			get
+			{
+				return _sampleRate;
+			}
+		}
+
+		public int BitsPerSample
+		{
+			get
+			{
+				return _bitsPerSample;
+			}
+		}
+
+		public int BlockAlign
+		{
+			get
+			{
+				return _blockAlign;
+			}
+		}
+
+		public NameValueCollection Tags
+		{
+			get
+			{
+				return new NameValueCollection();
+			}
+			set
+			{
+			}
+		}
+
+		public void GetTags(out List<string> names, out List<string> values)
+		{
+			names = new List<string>();
+			values = new List<string>();
+		}
+
+		public uint Read(byte[] buff, uint sampleCount)
+		{
+			if (sampleCount > Remaining)
+				sampleCount = (uint)Remaining;
+
+			uint byteCount = sampleCount * (uint)_blockAlign;
+
+			if (sampleCount != 0)
+			{
+				if (_fs.Read(buff, 0, (int)byteCount) != byteCount)
+				{
+					throw new Exception("Incomplete file read.");
+				}
+				_samplePos += sampleCount;
+			}
+
+			return sampleCount;
+		}
+
+		public string Path { get { return _path; } }
+	}
+
+	public class WAVWriter : IAudioDest
+	{
+		FileStream _fs;
+		BinaryWriter _bw;
+		int _bitsPerSample, _channelCount, _sampleRate, _blockAlign;
+		long _sampleLen;
+		string _path;
+		private byte[] _sampleBuffer;
+
+		public WAVWriter(string path, int bitsPerSample, int channelCount, int sampleRate)
+		{
+			_path = path;
+			_bitsPerSample = bitsPerSample;
+			_channelCount = channelCount;
+			_sampleRate = sampleRate;
+			_blockAlign = _channelCount * ((_bitsPerSample + 7) / 8);
+
+			_fs = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read);
+			_bw = new BinaryWriter(_fs);
+
+			WriteHeaders();
+		}
+
+		public bool SetTags(NameValueCollection tags)
+		{
+			return false;
+		}
+
+		private void WriteHeaders()
+		{
+			const uint fccRIFF = 0x46464952;
+			const uint fccWAVE = 0x45564157;
+			const uint fccFormat = 0x20746D66;
+			const uint fccData = 0x61746164;
+
+			_bw.Write(fccRIFF);
+			_bw.Write((uint)0);
+			_bw.Write(fccWAVE);
+
+			_bw.Write(fccFormat);
+			_bw.Write((uint)16);
+			_bw.Write((ushort)1);
+			_bw.Write((ushort)_channelCount);
+			_bw.Write((uint)_sampleRate);
+			_bw.Write((uint)(_sampleRate * _blockAlign));
+			_bw.Write((ushort)_blockAlign);
+			_bw.Write((ushort)_bitsPerSample);
+
+			_bw.Write(fccData);
+			_bw.Write((uint)0);
+		}
+
+		public void Close()
+		{
+			const long maxFileSize = 0x7FFFFFFEL;
+			long dataLen, dataLenPadded;
+
+			dataLen = _sampleLen * _blockAlign;
+
+			if ((dataLen & 1) == 1)
+			{
+				_bw.Write((byte)0);
+			}
+
+			if ((dataLen + 44) > maxFileSize)
+			{
+				dataLen = ((maxFileSize - 44) / _blockAlign) * _blockAlign;
+			}
+
+			dataLenPadded = ((dataLen & 1) == 1) ? (dataLen + 1) : dataLen;
+
+			_bw.Seek(4, SeekOrigin.Begin);
+			_bw.Write((uint)(dataLenPadded + 36));
+
+			_bw.Seek(40, SeekOrigin.Begin);
+			_bw.Write((uint)dataLen);
+
+			_bw.Close();
+
+			_bw = null;
+			_fs = null;
+		}
+
+		public long Position
+		{
+			get
+			{
+				return _sampleLen;
+			}
+		}
+
+		public long FinalSampleCount
+		{
+			set
+			{
+			}
+		}
+
+		public void Write(int[,] buff, uint sampleCount)
+		{
+			if (sampleCount == 0)
+				return;
+			if (_sampleBuffer == null || _sampleBuffer.Length < sampleCount * _channelCount)
+				_sampleBuffer = new byte[sampleCount * _blockAlign];
+			AudioCodecsDotNet.FLACSamplesToBytes(buff, 0, _sampleBuffer, 0,
+				sampleCount, _channelCount, _bitsPerSample);
+			_fs.Write(_sampleBuffer, 0, (int)sampleCount * _blockAlign);
+			_sampleLen += sampleCount;
+		}
+
+		public string Path { get { return _path; } }
+	}
+}